I personal see that there are scalability difficulties with cryptocurrencies, which means they may not be able to process enormous quantities of transactions at once. This might make them difficult to utilize for routine transactions, since these transactions may take too long to process and complete.
Maybe what you mean is the problem of busy network transactions that occur in bitcoin as it is today and where bitcoin transactions are very expensive, but in normal cases this will return to normal and there are several exchanges and wallets that can manage transaction fees and you can adjust them to your needs you, so it's less fixed what you mean in this post.
So if you're asking yourself can I invest?
You can if you have money and obviously you can't when you don't have money.
Is bitcoin worth investing in?
Very decent and even one of the best at the moment compared to other cryptos.
Is it smart choice to invest?
There are many reasons that can convince us that bitcoin is a smart choice to invest, besides being able to maintain value and bitcoin also has the strength to survive when the economy is experiencing a crisis or recession.
Then you need to understand the challenges involved, the pros and cons, what makes it difficult to invest or not.
Knowledge can bring someone to believe and understand bitcoin, the challenges of pros and cons in life cannot be separated in any aspect, including when you try to invest in bitcoin so you can see other aspects of utilization when you choose bitcoin.